Improvement in friction-clutches



T. SYMONDS.

Friction-Clutches.

N0.l50-,IO3, Patented April 21,1874.

[ux VA,

NrTEn STATES PATENT EEIcE.

THOMAS sYMoNDs, or cAMDEN, NEW JEnsEY.

IMPROVEMENT IN FRICTlON-CLUTCHES..

Specification forming part of Letters Patent No. 150,103, dated AprilQ1, 1874; application filed March 10, 1874.

To all whom it may concern: Be it known that I, THOMAS SYMoNDs, ofCamden, New Jersey, have invented an Improvement in Friction-Brakes, ofwhich the following is a specification:

The object of my'invention is the construcltion of a simple andeffective iriction-brake to be used in connection with hoistingmechanism or driving pulleys or wheels which have to be connected to ordisconnected from a driving-shaft; and this object I attain in themanner which I will now proceed to describe, reference being had to theaccompanying draw- A in g, in which- Figure l represents a verticalsection of the friction-brake, Fig. 2 being a transverse section on theline l 2, and Fig. 3 a detached view of one of the links.

A is the driving-shaft, on which the barrel B of hoisting mechanism isarranged to revolve freely, one end of the barrel having a disk, a,forming part of a iiangc or rim, b, the interior of which presents asurface adapted to brake or friction blocks D, of which there are fourin the present instance, as shown in Fig. 2. rlhese blocks are confinedbetween a disk, E, secured to or forming part of the driving-shaft A,and a ring, F, attached to the said disk, and are guided laterally byprojections d on the said disk, as shown in Fig. 2. Each block D isconnected by a link, G, a sectional view ot' which is shown in Fig. 3,to a collar, II, so adapted to the tubular portion A ofthe driving-shaftwhich projects beyond the disk E that it can slide freely thereon. Akey, c, passes through the collar H, and through a slot in the tubularportion A of the shaft, and within the latter is a spiral spring,against which the key bears. A pin, I, is fitted into the end of theshaft, and is slotted at the inner end, so as to embrace the key andbear against the same. (See Figs. l and 4.) In the present instance, abell-crank lever, J, is hinged to one of the bearings of thedrivingshaft, its short arm bearing against the end of the pin I, sothat by depressing the long arm of the lever, the pin I can be forcedinward. Any other suitable device may, however, be employed foroperating the pin.

The shaft A, disk E, collar II, brake-blocks D, links G, and pin I allrevolve together, and as long as the brake-blocks, links, and collar arein the position shown in Figs. l and 2, these parts must revolveindependently of the barrel, but on forcing the pin I, and with it thecollar H, inward, all the brake-blocks D must be necessarily forcedoutward and against the interior of the rim b, when the barrel B mustnecessarily revolve with the driving-shaft. v

' The guides cl are important elements when viewed in connection withthe collar, links, and brake-blocks, for the moment the blocks come incontact with the rim b, they would be displaced laterally, andthe linkswould be subjected to violent strains but for the presence of theseguides.

It will be seen, on referencel to Fig. 3, that each link is composed ot'two ,parts connected together'by a screw-coupling, m, and secured bytightening nuts a n, so that the length of the link may be increased ordiminished at pleasure. rlhe most delicate adjustinent'of the blocks, sothat all may act simultaneously on the rim, may be thus accomplishedthrough the adjustment of the links. l

As a simple and effective device, through the medium of which thebrake-blocks can be operated, the central'pin I forms a special featureof my invention.

It will be evident that the rim b may be secured to or forin a part of adrivin g-wheel or driving-pulley lullig' loosely to the drivingshaft, inplace of the barrel B.

I claim as my inventionl. The combination of the disk Fi on thedriving-shaft and its guides el with brakeblocks D, operated through theniediuni of de vices substantially as described, and with the rim l) ofa barrel or driving wheel or pulley hung loosely to the said shaft.

2. The sliding collar l-I, connected `to the brake-blocks, and arrangedto slide on but turn with the driving-shaft, in combination with acentral pin, I, adapted to the tubular portion of the shaft, and to thekey e of the slide, all

substantially as set forth.

Y 3. The combination of the sliding collar H,

the adjustable links Gr, and brake-blocks D.

In testimony whereof I have signed my name to this specification in thepresence ot' two subscribing witnesses.

THOMAS SYMONDS. Witnesses VM. A. STEEL, HARRY SMITH.

